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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db541fea0b373ee2be07dd6be6fad0f32504693515bc34100e54d7e31501ccb' 
  AND token = 'EBhHBv9RhIcnS2JRk1wpJ4zu4zeNxDka4AOeREefkrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}